public ItemNumericalSet GetRandomSubset(float subcountRatio, bool withReplacement)
{
var idxLst = GetRandomIndeces(Count(), subcountRatio, withReplacement);
ItemNumericalSet res = new ItemNumericalSet(_featureManager);
foreach (int idx in idxLst)
{
res.AddItem(_items[idx]);
}
return(res);
}
public static ItemNumericalSet ParseItemNumericalSet(string path, int sheetNo = 1)
{
FileInfo fi = new FileInfo(path);
if (!fi.Exists)
{
throw new FileNotFoundException();
}
OfficeOpenXml.ExcelPackage xls = new OfficeOpenXml.ExcelPackage(fi);
var sheet = xls.Workbook.Worksheets[sheetNo];
int cols = sheet.Dimension.End.Column;
int rows = sheet.Dimension.End.Row;
List <string> featureNames = new List <string>();
for (int j = 1; j <= cols; j++)
{
var fn = sheet.Cells[1, j].Value;
if (fn == null)
{
throw new Exception();
}
string str = fn.ToString();
if (string.IsNullOrEmpty(str))
{
throw new Exception();
}
featureNames.Add(str);
}
ItemNumericalSet set = new ItemNumericalSet(featureNames);
for (int i = 2; i <= rows; i++)
{
FeatureNumericalValue[] arr = new FeatureNumericalValue[cols];
for (int j = 1; j <= cols; j++)
{
var v = sheet.Cells[i, j].Value;
arr[j - 1] = new FeatureNumericalValue {
FeatureName = featureNames[j - 1], FeatureValue = Convert.ToDouble(v)
};
}
set.AddItem(arr);
}
return(set);
}
public ItemNumericalSet Clone()
{
FeatureNumericalManager fm = new FeatureNumericalManager();
List <string> names = _featureManager.GetFeatureNames();
foreach (string n in names)
{
FeatureNumerical f = _featureManager.Get(n);
FeatureNumerical nf = new FeatureNumerical(f.Name);
fm.Add(nf);
}
ItemNumericalSet res = new ItemNumericalSet(fm);
return(res);
}